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Abiotic Factors (GCSE Biology)

The following is a GCSE Biology test covering 'Abiotic Factors' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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In a coastal estuary, which abiotic factor fluctuates daily and strongly affects which species can live there?
Which abiotic factor would ecologists measure to estimate potential for soil compaction and root penetration?
In aquatic ecosystems, which abiotic factor most directly limits the distribution of many fish species?
In an experiment on aquatic plants, which abiotic factor would you change to investigate its effect on gas bubble production as a measure of photosynthesis?
Which abiotic factor is measured in lux and commonly used in plant-growth experiments?
When investigating effects of temperature on an ectotherm’s activity, which abiotic factor must be controlled to make the experiment valid?
Which abiotic factor is most important in determining the oxygen concentration for organisms living in soil?
Which abiotic factor most directly changes the oxygen-carrying capacity of water for aquatic organisms at higher altitudes?
Which abiotic factor most directly influences the zonation of organisms on a rocky shore (from high to low tide)?
Which abiotic factor describes the amount of water held in soil that plants can use?
Which abiotic factor would you vary to test its effect on the rate of seed germination in a laboratory experiment?